Institutional Revolutionary Party

The Institutional Revolutionary Party (PRI) is a centrist political party in Mexico that was founded on 4 March 1929 by Plutarco Elias Calles. The PRI is opposed to the socialist Party of the Democratic Revolution, although it is a member of Socialist International like the PRD. With 208/500 seats in the Chamber of Deputies, 55/128 senate seats, and 19/32 governorships as of 2016, it is the largest party in the country.